When I found myself having to split an android application (APK file) to allow it to be uploaded onto the Google Play store, I found a serious lack of current information and much misdirection possibly due to the recent changes within Unity and the actual Play store itself.

So here is a rough guide that works with unity 4.3 or up, in this example I am only catering for devices running android 4.0 ICS or up ( API level 16), not quite sure what to do with earlier Android API versions at this very moment.

STEP -1

Firstly ignore the asset store OBB plug-in (it was created for earlier versions of unity, or possibly for catering for earlier Android API’s) going down this route will burn hours of your life.

STEP 1

If you haven’t done so already go to EDIT>PROJECT SETTINGS>PLAYER SETTINGS select the android role out and go to the PUBLISHING SETTINGS roll-out and do the following:-

1) Create a new keystore by selecting a keystore name and password (confirm the password)
2) Select “Create a new key” under Key Alias
3) A new window opens; enter the necessary information.
4) Select the newly created key.

n.b. Remember the passwords; they are not stored with the project (for security reasons), every time you load the project you will need to enter this password from now on.

5) Tick Split Application Binary at the bottom of this roll out!

STEP 2

Again if you haven’t already done so create a primary loading scene with very little content, this will allow unity to split most of your app data off to the OBB data/zip file and keep the APK file size small. As an example I created a scene called Android Loader, so that I could exclude […]

I was going to place this on the asset store, but someone already has put something on there, so here you go for free, this shader simply removes a set colour with tolerance from a texture and makes its transparent. It is really useful when using video/movie textures with Qualcomm Vuforia plugin to cut out a person for instance on a blue screen / keyable background to then plant that character in an Augmented Reality setting:

As advised below, this shader should possibly tagged with the keywords IOS, Android, Alpha, Channel. Hope this helps.